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Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
May 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]        
Funds borrowed under repurchase agreement     $ 271,642 $ 565,431
Weighted average interest rates     0.29% 0.11%
Loans Pledged As Collaterals     $ 4,040,000  
Borrowing Rate     4.65%  
higher cost Borrowings     $ 2,070,000  
Short term borrowings     995,000  
Collateral Pledged [Member]        
Debt Instrument [Line Items]        
Investment securities at carrying value     $ 5,290,000  
Federal Home Loan Bank Advances and Other Borrowings [Member]        
Debt Instrument [Line Items]        
Weighted average interest rates     5.70%  
Borrowing Rate     4.78%  
higher cost Borrowings     $ 160,000  
Maturities of advances BTFP $ 1,200,000 $ 695,000    
Short term borrowings     2,070,000  
Short Term Advances     $ 1,910,000